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Indiana Department of Natural Resources

Forestry > Forestry BMP's > Forest Roads > Constructing Forest Roads > Recommended Maximum Spacing for Drainage Structures Recommended Maximum Spacing for Drainage Structures

Slope (percent) Broad-based Dips and Culverts (feet) Turnouts and water bars (feet)
2
5
10
15
20
25
300
180
140
125
120
115
250
125
80
60
40
30